Thread: Coolant loss - 6x6 4bd1t

A bit hard to tell from those photos Mick, I think one of them is the rear of the vac pump on the alternator - how did coolant get there? Maybe from fan airflow.
The are some possibilities I can think of
1........Water pump
2........Bypass hose on water pump
3........Top or bottom turbo coolant hoses
4........Thermostat housing
5........Corroded heater hose fittings (water pump and thermo housing)
6.........Or maybe a leaking heater hose
Good luck! Trial and error will find it. I would take it for a run and get it hot them lift the bonnet and start looking.

Originally Posted by Mick_Marsh

Over a year ago, the Perentie was registered. After a bit of a run, cooland was observed in a big puddle under the left hand side under the firewall. This leak was cured by replacing the heater core. This put pressure on the next failure, the bottom radiator hose. The amount of coolant lost from that one was considerably less. Well, the next bit of the cooling system to fail was the radiator. It didn't lose much coolant but you could see the tell tale signs. So the radiator was re-cored.
That brings you up to date.
So. the Perentie was taken for a taxing run last week. It didn't lose much but there was a puddle of green stuff left on the ground after it had been sitting for a while.
I tightened the hoses today and pressure tested the system. It didn't hold pressure.

So, where do you think this leak is?


And is this my next coolant leak?

Grab a helper, get them to pressurize the system while you get under the engine and see if you can see/hear where the leak is.